Jaguar S type 4.2 computer has recently switched to limp

Resolved Question:

Jaguar S type 4.2 computer has recently switched to limp home mode and shown "engine problem" and "park brake malfunction" have been able to get it back to normal driving by turning motor off and restarting then tried to reset computer by disconnecting and reconnecting battery which then got rid of engine warning light and car drove okay for a very short distancewhen tried to take car out next day it showed "parkbrake malfunction" and parkbrake is locked on and car cannot be moved

Hello and welcome, Super mechanic here. Thank you for trusting us with your vehicle concerns, I will do my best to help you with your question.

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The parking brake module is sensitive to battery voltage below 8 volts for more than 20 milliseconds. When a vehicle has been left parked for some period it is possible that this threshold may be reached.

There were some service bulletins for that type of concern, which involves a software update of the PBS controller, which would have to be done by the dealership, I hate to have to say..

Brakes - Parking Brake Won't Release

NUMBER: JTB00044 MODEL: S-TYPE, XJ DATE: JULY 12, 2007

SECTION 206-00

Parking Brake Does not Release

CONDITION SUMMARY:

LOW VOLTAGE BLOCKS PARKING BRAKE RELEASE

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Cause:

The parking brake module is sensitive to battery voltage below 8 volts for more than 20 milliseconds. When a vehicle has been left parked for some period it is possible that this threshold may be reached.

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Action:

Should a customer express concern, re-configure the parking brake module to the new software level to resolve this issue using Integrated Diagnostic System (IDS).

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PARTS:

No parts required

TOOLS:

IDS DVD107 with Patch File 4

WARRANTY:

NOTE: Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Always refer to DDW to obtain the latest repair time.

DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

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